add EditorConfig

.editorconfig

@@ -0,0 +1,36 @@
+# EditorConfig is awesome: https://EditorConfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{js,py}]
+charset = utf-8
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[*.cr]
+indent_style = space
+indent_size = 2
+
+[{*.html,*.css}]
+indent_style = tab
+indent_size = 4
+
+[Makefile]
+indent_style = tab
+
+[lib/**.js]
+indent_style = space
+indent_size = 2
+
+[{package.json}]
+indent_style = space
+indent_size = 2